Gene Therapy Is Increasingly Relied Upon as a Part of Cancer

Gene therapy is increasingly relied upon as a part of cancer treatment because

A) it helps the patient's immune system recognize mutations and destroy them.
B) it produces radioactive isotopes that can be used to trace the locations of cancer in the body which makes treatment easier.
C) it make healthy cells more tolerant of chemotherapy, while making tumor cells more sensitive.
D) it helps cells to produce their own anticancer drugs.
E) All of the answer choices are correct.